If you're experiencing audio delay issues, read this

I have an LGOLEDC9 - upgraded from a TCL screen - and the sound sync makes it feel like amateur hour. It’s a real shame that Sonos and LG can’t figure out a fix here and it’s really unfair that users like us have to team up to figure out which TVs work with this system. Now I’m stuck with a $2500 TV and a $1600 sound system that don’t work together. Getting that TV back in the box? No thanks. Giving up on Sonos? Nearly…

Sonos - read this thread, stop pretending to fix it with 5 increments in sound delay on the app. Figure it out. Be real engineers with a product you can really stand behind. #Upyourgame2020

Same situation here, LG C9 and Sonos Beam connected via HDMI, experiencing audio delay when using my PS4 outputting bitstream.  Changing the output to Linear PCM resolves the audio delay but is stereo only and sounds rubbish compared to bitstream.  I’ve emailed a complaint to LG but not holding out much hope for a resolution. 

It’s astonishing how many posts there are on the internet detailing the same problem going back to at least 2017.  People are spending extra money on what appears to be very inelegant solutions to something that could surely be resolved, if only these companies would take some collective responsibility and work together in the interests of their customers.

While I agree with your irritation, this isn’t something that Sonos can be involved in. As has been repeatedly shown by people who “spend extra money”, as you’ve accurately put it, the Sonos works properly. The issue is in the ability for LG (and Samsung) to not delay the signal as it goes through the TV.

I replaced a TV recently, and looked at both LG and Samsung as potentials. I ended up with another Vizio, because I was confident it could pass through a Dolby Digital signal without delaying it. And I was correct, my Sonos continues to work perfectly, as it had on my previous Vizio. 

I have an LG OLED55B8SLC and a sonos beam with 2 x sonos one SL, and I'm experiencing exactly the same audio lag whenever I switch to dolby 5.1. I've partially resolved this issue from my ps4 by outputting optical, connected directly to the beam using the supplied hdmi/optical adapter and it works well. The only problem is that I have to physically change the hdmi cable that is attached to the beam whenever I'm wanting to use something other than the ps4.

Some people seem to claim that they have resolved this entire problem using some kind of splitter... Is someone able to elaborate on this and suggest one that would work? 

You need an optical/toslink switch.  There are many on amazon to choose from with varying numbers of inputs. They all do the same job.

You can also use a hdmi switch that has an optical extractor on it so that all your hdmi inputs go to it but the hdmi output of the switch only sends video, the audio being extracted/converted to an optical output on the switch that goes to your beam. 

Thanks Andy. So would something like this do the job? And if so, would it still allow me to control everything from a single remote? The only connected hdmi device I use is the ps4, but I run Netflix directly via the TV (for the best quality). 

https://smile.amazon.co.uk/dp/B07YD2CLMY/ref=cm_sw_r_cp_apa_i_mbBlEb7N4CG0N

That takes no optical inputs so your hdmi connection from your ps4 would need to connect to it and then optical split from the switch to the beam via an optical cable and the supplied sonos converter cable.  However, as you are using the inbuilt apps on your TV you need to get the audio out from there as well to beam which is where this solution might break.  The switch says arc compatible but I suspect that might only be on the output hdmi of the switch and not the inputs. 

If it were me to be safe I would get a optical/toslink switch without the hdmi, that way you can take optical audio feeds from ps4 and TV to the optical inputs of the switch then to a single optical output going to beam.

As for switch control, that depends on the switch. Most come with remotes which you could consolidate with a harmony device. 

Hi again. I eventually ordered this :

eSynic Spdif Toslink Switcher 3 X 1 Digital Optical Audio Switch with IR Remote Control Support LPCM2.0 PCM2.0 DTS Dolby-AC3 Dolby Digital DTS 5.1 Dolby Digital Plus https://smile.amazon.co.uk/dp/B07B8NMPBN/ref=cm_sw_r_cp_apa_i_0CenEb0W66VTV

... Which does the job fine, and all lip sync problems are gone! It's a bit of a faff to have to manually switch between inputs, but I can deal with it. What I'm now struggling with is the fact that I can no longer control the volume of the system without using the Sonos app (which my wife is obviously not thrilled about!). Is there anything that can be done about this? Should I have got an optical switch with hdmi out to the beam instead? 

You should still be able to set up the Beam to respond to the IR from your remote. Just go into the room settings for the Beam, and reprogram the Beam to ‘see’ the remote there. 

Thanks, but I tried this and it didn't work (despite going into the TV settings and turning on "LG sound sync").